PROFIBUS-DP - Jumo · PROFIBUS-PA PROFIBUS-PA has been specifically ... As a suitable cable we recommend the following type from Siemens: Simatic Net Profibus …

PROFIBUS-DP

B 95.5010.2.3Interface Description

10.01/00395223

Contents

1 Introduction 3

1.1 Preface .......................................................................................................... 3

1.2 Typographical conventions ......................................................................... 41.2.1 Warnings ........................................................................................................ 41.2.2 Note signs ...................................................................................................... 4

2 Profibus description 5

2.1 Profibus types ............................................................................................... 5

2.2 RS485 transmission technology ................................................................. 6

2.3 PROFIBUS-DP .............................................................................................. 9

3 Configuring a PROFIBUS system 11

3.1 GSD files ...................................................................................................... 11

3.2 Configuration procedure ........................................................................... 12

3.3 The GSD generator .................................................................................... 133.3.1 General ........................................................................................................ 133.3.2 Operation ..................................................................................................... 133.3.3 Example report ........................................................................................... 15

3.4 Connection example .................................................................................. 173.4.1 RECORDER .................................................................................................. 173.4.2 GSD generator ............................................................................................. 173.4.3 PLC configuration ........................................................................................ 18

4 Device-specific data 21

4.1 System requirements ................................................................................. 21

4.2 Connection diagram .................................................................................. 22

4.3 Setting the slave address .......................................................................... 23

4.4 Diagnostic and status messages .............................................................. 23

4.5 Acyclic data ................................................................................................ 23

4.6 PLC data in 16-bit format .......................................................................... 28

4.7 Bit-by-bit coding of binary signals ........................................................... 30

4.8 External inputs on faults in the data exchange ....................................... 31

5 Data format of the recorder 33

Contents

1 Introduction

1.1 PrefacePlease read this manual before starting up the interface. Keep the manual in aplace which is accessible to all users at all times.

Please assist us to improve this manual.

Your suggestions will be welcome.

H If any difficulties should arise during commissioning, you are askednot to carry out any unauthorized manipulations. You could endan-ger your rights under the instrument warranty!

Please contact the nearest subsidiary or the main factory in such acase.

EWhen returning chassis, modules or components, the regulationsof EN 100 015 “Protection of electrostatically sensitive compo-nents” must be observed. Use only the appropriate ESD packag-ing for transport.

Please note that we cannot accept any liability for damage causedby ESD (electrostatic discharge).

B

3

1 Introduction

1.2 Typographical conventions

1.2.1 Warnings

The signs for Danger and Caution are used in this manual under the followingconditions:

VDanger

This symbol is used where there may be danger to personnel if the instruc-tions are disregarded or not followed accurately!

ACaution

This symbol is used where there may be damage to equipment or data if theinstructions are disregarded or not followed accurately!

ECaution

This symbol is used if precautions must be taken when handling electrostati-cally sensitive components.

1.2.2 Note signs

HNote

This symbol is used to draw your special attention to a remark.

vReference

This symbol refers to additional information in other manuals, chapters orsections.

abc1Footnote

Footnotes are notes which refer to certain points in the text.Footnotes consist of two parts:

Marking in the text and the footnote text.

The marking in the text is arranged as continuous superscript numbers.

h

Handling instructions

This symbol marks the description of a required action.

The individual steps are indicated by an asterisk, e. g.

h Press the h key

h Confirm with E

4

2 Profibus description

PROFIBUS is a manufacturer-independent, open fieldbus standard for a widerange of applications in manufacturing, process and building automation.Manufacturer independence and openness are ensured by the internationalstandard EN 50 170.Using PROFIBUS, devices from different manufacturers can communicatewithout any special interface adjustments. PROFIBUS can be employed forboth high-speed time-critical data transmission and extensive, complex com-munication tasks. The PROFIBUS family consists of three versions.

2.1 Profibus types

The PROFIBUS family

PROFIBUS-DP This PROFIBUS version, which is optimized for high speed and low connec-tion costs, has been especially designed for communication between auto-mation control systems (PLC) and distributed field devices (typical accesstime: < 10msec). PROFIBUS-DP can be used to replace conventional, parallelsignal transmission with 24V or 0/4—20mA.

DPV0: cyclic data transfer:--> is supported by the recorder.

DPV1: cyclic and acyclic data transfer:--> is not supported by the recorder.

DPV2: slave-to-slave communication takes place in addition to cyclic andacyclic data transfer:--> is not supported by the recorder.

PROFIBUS-PA PROFIBUS-PA has been specifically designed for process engineering. It per-mits the linking of sensors and actuators to a common bus cable, even in haz-ardous areas. PROFIBUS-PA enables the data communication and energysupply for devices in two-wire technology according to the international IEC1158-2 standard.

PROFIBUS-FMS This is the universal solution for communication tasks at cell level (typical ac-cess time: approx. 100msec). The powerful FMS services open up a widerange of applications and provide a high degree of flexibility. FMS is also suit-able for extensive communication tasks.

5


2.2 RS485 transmission technologyTransmission takes place according to the RS485 standard. It covers all areasin which a high transmission speed and simple, cost-effective installation arerequired. A shielded twisted copper cable with one conductor pair is used.

The bus structure permits addition and removal of stations or step-by-stepcommissioning of the system without affecting the other stations. Later expan-sions have no influence on the stations which are already in operation.

Transmission speeds between 9.6 kbit/sec and 12 Mbit/sec are available. Oneuniform transmission speed is selected for all devices on the bus when thesystem is commissioned.

Basic features of the RS485 transmission technology

Installationtips

All devices are connected in a bus structure (line). Up to 32 stations (master orslaves) can be linked up in one segment.The bus is terminated by an active bus terminator at the start and end of eachsegment. Both bus terminators must always be powered, to ensure fault-freeoperation.If there are more than 32 users, repeaters must be used to link up the individu-al bus segments.

Network topology linear bus, active bus termination at both ends,stub cables are only permissible for baud rates≤1.5 Mbit/sec.

Medium shielded twisted-pair cable

Number of stations 32 stations in each segment without repeater (line amplifier). With repeaters, this can be expanded to 126.

Connector preferably 9-pin sub-D connector

6


Cable length The maximum cable length depends on the transmission speed. The cablelength specified can be extended by using repeaters. It is recommended notto connect more than 3 repeaters in series.

Range based on transmission speed

Cable data These cable length specifications refer to the cable type described below:

Characteristic impedance: 135 — 165 ΩCapacitance per unit length: < 30 pf/mLoop resistance: 110 Ω/kmCore dia.: 0.64 mmCore cross-section: > 0.34 mm²

It is preferable to use a 9-pin sub-D connector for PROFIBUS networks incor-porating RS485 transmission technology. The pin assignment at the connectorand the wiring are shown at the end of this chapter.

PROFIBUS cables and connectors are supplied by several manufacturers.Please refer to the PROFIBUS product catalog (www.profibus.com) for typesand addresses of suppliers.

When connecting up the devices, make sure that the data lines are not re-versed. It is absolutely essential to use shielded data lines. The braided shieldand the screen foil underneath (if present) should be connected to the protec-tive earth on both sides, and with good conductivity. Furthermore, the datalines should be routed separately from all high-voltage cables, as far as this ispossible.

As a suitable cable we recommend the following type from Siemens:

Simatic Net Profibus 6XV1 Order No. 830-0AH10 * (UL) CMX 75 °C (Shielded) AWG 22 *

Baud rate(kbit/s)

9.6 19.2 93.75 187.5 500 1500 12000

Range/segment 1200 m 1200 m 1200 m 1000 m 400 m 200 m 100 m

7


Data rate For installation, the use of stub cables must be avoided for data rates above1.5 Mbit/sec.

Wiring andbus termination

H For important tips on installation, please refer to the InstallationGuidelines PROFIBUS-DP, Order No. 2.111 by the PNO (ProfibusUser Organization).

Address:Profibus Nutzerorganisation e.V.Haid- u. Neu-Straße 7D-76131 Karlsruhe, Germany

Internet: www.profibus.com

Recommendation:

Please follow the installation recommendationsmade by the PNO, especially for the simultaneous useof frequency inverters.

8


2.3 PROFIBUS-DPPROFIBUS-DP is designed for high-speed data exchange at the field level.The central control devices, PLC/PC for instance, communicate through a fastserial connection with distributed field devices such as I/O, paperlessrecorders and controllers. Data exchange with these distributed devices ismainly cyclic. The communication functions required for this are defined bythe basic PROFIBUS-DP functions in accordance with EN 50 170.

Basicfunctions

The central controller (master) reads the input information cyclically from theslaves and writes the output information cyclically to the slaves. The bus cycletime must be shorter than the program cycle time of the central PLC. In addi-tion to cyclic user data transmission, PROFIBUS-DP provides powerful func-tions for diagnostics and commissioning.

Transmission technology:• RS485 twisted pair• Baud rates from 9.6 kbit/sec up to 12 Mbit/sec

Bus access:• Master and slave devices, max. 126 users on one bus

Communication:• Peer-to-peer (user data communication) • Cyclic master-slave user data communication

Operating states:• Operate: Cyclic transmission of input and output data• Clear: Inputs are read, outputs remain in secure state• Stop: Only master-master data transfer is possible

Synchronization:• Sync mode: not supported by the recorder• Freeze mode: not supported by the recorder

Functionality:• Cyclic user data transfer between DP master and DP slave(s)• Dynamic activation or deactivation of individual DP slaves• Checking the configuration of the DP slaves• Address assignment for the DP slaves via the bus• Configuration of the DP master via the bus• maximum of 246 bytes input/output data for each DP slave

Protective functions:• Address monitoring for the DP slaves• Access protection for inputs/outputs of the DP slaves• Monitoring of user data communication with adjustable monitoring timer in the master

Device types:• DP master Class 2, e. g. programming/project design devices• DP master Class 1, e. g. central automation devices such as PLC, PC…• DP slave e. g. devices with binary or analog inputs/outputs, controllers, recorders...

9


Cyclicdatatransmission

The data transmission between the master and the DP slaves is carried out bythe master in a defined, recurring order. When configuring the bus system, theuser defines the assignment of a DP slave to the master. It is also definedwhich DP slaves are to be included in, or excluded from, the cyclic user datacommunication.

Data transmission between the master and the DP slaves is divided into threephases: parameterization, configuration and data transfer. Before a DP slaveenters the data transfer phase, the master checks in the parameterization andconfiguration phase whether the planned configuration matches the actual de-vice configuration. In the course of this check, the device type, format andlength information, as well as the number of inputs and outputs must agree.These checks provide the user with reliable protection against parameteriza-tion errors. In addition to the user data transfer, which is performed automati-cally by the master, new parameterization data can be sent to the DP slaves atthe request of the user.

User data transmission in PROFIBUS-DP

10

3 Configuring a PROFIBUS system

3.1 GSD filesDevice base data (GSD) enable open project design.

PROFIBUS devices have different features. They differ with respect to theavailable functionality (e. g. number of I/O signals, diagnostic messages) orpossible bus parameters, such as baud rate and time monitoring. These pa-rameters vary individually for each device type and manufacturer. In order toobtain simple Plug & Play configuration for PROFIBUS, the characteristic de-vice features are defined in an electronic device data sheet (Device Data BaseFile, GSD file). The standardized GSD files expand open communication up tothe operator level. By means of the project design tool, which is based on theGSD files, devices from different manufacturers can be integrated into a bussystem, simply and user-friendly. The GSD files provide a clear and compre-hensive description of a device type in a precisely defined format. GSD filesare prepared according to the application. The defined data format permits theproject design system to simply read in the GSD files of any PROFIBUS-DPdevice and automatically use this information when configuring the bus sys-tem. Already during the project design phase, the project design system canautomatically perform checks for input errors and the consistency of data en-tered in relation to the entire system.

The GSD files are divided into three sections.

• General specificationsThis section contains information on manufacturer and device names, hardware and software release states, baud rates supported and thepossible time intervals for monitoring times.

• DP master-related specificationsThis section contains all the parameters related to DP-master devices only,such as the maximum number of DP slaves that can be connected, or upload and download options. This section is not available for slavedevices.

• DP-slave related specificationsThis section contains all slave-related specifications, such as the number and type of the I/O channels, specification of diagnostic texts andinformation on the consistency of I/O data.

The GSD format is designed for flexibility. It contains lists, such as the baudrates supported by the device, as well as the possibility of describing the mod-ules available in a modular device.

11


3.2 Configuration procedure

Plug & Play To simplify the configuration of the PROFIBUS system, the master (PLC) isconfigured using the PROFIBUS configurator and the GSD files, or in the PLCthrough the hardware configurator.

Configuration steps:

- Create GSD file by using the GSD generator

- Load GSD files of the PROFIBUS slaves into the PROFIBUS networkconfiguration software

- Perform configuration

- Load configuration into the system (e.g. PLC)

The GSD file The characteristic device features of a PROFIBUS slave are specified by themanufacturer, clearly and comprehensively in a precisely defined format, in theGSD file (Device Data Base File).

The PROFIBUSconfigurator / hardwareconfigurator (PLC)

This software can read in the GSD files for PROFIBUS-DP devices of any man-ufacturer and integrate them for the configuration of the bus system.

Already in the project design phase, the PROFIBUS configurator automaticallychecks the files that have been entered for errors in system consistency.

The result of the configuration is read into the master (PLC).

12


3.3 The GSD generator

3.3.1 General

GSD files for recorders with a PROFIBUS interface are generated by the userwith the aid of the GSD generator.The recorders with a PROFIBUS interface can send or receive a large varietyof variables (parameters). Since, however, in most applications, only a portionof these variables will be sent via PROFIBUS, the GSD generator makes a se-lection of these variables.

After selection of the device, all available variables are shown in the “Parame-ters“ window. Only after these have been copied to the “Input” or “Output”window will they later be contained in the GSD file for processing or pre-processing by the master (PLC).

3.3.2 Operation

File menu Input window(referred to the master)

Window with availableparameters

Output window(referred to the master)

Status line

Delete entry from input window

Delete entry from output window

Exit program

13


File menu The file menu can be called up using the Alt-D combination or the left mousebutton. It provides the following options:

New After calling up the function which creates a newGSD file, the available devices are selected. After se-lection of the required device, all available parame-ters are shown in the parameter window.

Open This function opens an existing GSD file.

Save/Save as

This function is available for saving the generated oraltered GSD file.

Diagnosis Using this function, the GSD file can be tested inconjunction with a Profibus-DP adapter from B+W.

Print preview shows the preview of a report1 that can be printed.

Print prints a report1.

Standardsettings

The language to be used at the next restart of theprogram can be selected here.

Exit exits the program.

H 1. The report contains additions information for the PLC programmer(e.g. data type of the selected parameters).

v Chapter 3.3.3 “Example report”

14


3.3.3 Example report

I/O report

Device: RECORDER

Length of inputs (byte): 7Length of outputs (byte): 4

Inputs

Byte Description Type-------------------------------------------------------------------------[ 0] Interface status BYTE[ 1] int. logic inputs\Bool_Out01 BOOLEAN[ 2] int. logic inputs\Bool_Out02 BOOLEAN[ 3] int. analogue inputs 16Bit\Int_Out01 INTEGER[ 5] int. analogue inputs 16Bit\Int_Out02 INTEGER

Outputs

Byte Description Type-------------------------------------------------------------------------[ 0] ext. analogue inputs 16Bit\Int_In01 INTEGER[ 2] ext. analogue inputs 16Bit\Int_In02 INTEGER

15


Selectparameter

If an existing file has been opened, or a new one created, all available parame-ters are shown in the parameter window.

A click with the left mouse button on the “+” ( ) symbolor “-” ( ) will extend the parameter list or reduce it.

Click on the parameter with the left mouse button, and, keeping it pressed,copy it to the input or output window by Drag & Drop.

Removeparameter

Parameters are deleted from the input or output window using the corre-

sponding button.

Device name (editable).The name is shown in the PLC program(hardware catalog).

H The parameter “Interface status” will automatically appear in the inputwindow and cannot be deleted. It is used for diagnosis of the internaldata transmission in the device and can be requested by the PLC:

0 : internal communication in device is OK

unequal 0 : faulty communication in device

16


3.4 Connection exampleThe example below shows the path for the connection of a recorder to a S7from Siemens.

3.4.1 RECORDER

h Connect the device to the PLC.

h Set the device address.The device (instrument) address can be selected via the instrument keys orthrough the setup program.

3.4.2 GSD generator

h Start up the GSD generator (Example: Start ! Programs !OEM devices ! Profibus ! GSD generator).

h Select the recorder.

h Select the variables that are transmitted to the master.

17


h Save the GSD file in any folder.

3.4.3 PLC configuration

h Start the PLC software.

h Call up the hardware configuration and execute menu command“Install new GSE”.

The new GSD file is read in and processed, and the recorder is inserted in the hardware catalog.

PLC with itscomponents

Bus

18

h Open the hardware catalog and place the new device in the working area.
The recorder is placed on the bus using the left mouse button. After releas-ing the mouse button, the recorder address has to be assigned.The baud rate is determined automatically.

h Finally, you have to load the configuration into the PLC (PLC ! Download to module)

19


20

4 Device-specific data

By using the paperless recorder, you can visualize and record up to 36 analogchannels of a PLC.

This chapter describes the connection to the PROFIBUS-DP for the paperlessrecorder.

4.1 System requirementsThe following requirments have to be met when connecting a paperless re-corder to the PROFIBUS-DP:

- Fit the PROFIBUS-DP interface to the paperless recorder

- Program version from 100.03.02The program version can be requested from the paperless recorder menus via Device (Instrument) info ! Version number.

H All the devices described can be used exclusively as DP slaves.

21


4.2 Connection diagram

Rear view ofpaperlessrecorder

Connector 21

Interface PROFIBUS-DP

ConnectionsSub-D Signal Designation

3 RxD/TxD-P Receive/Transmit Data-P, B-cable

5 DGND Data transmission potential

6 VP Supply voltage-P, (P5V)

8 RxD/TxD-N Receive/Transmit data-N, A-cable

H When making the connection to the PROFIBUS-DP it is importantto ensure that the connectors 20 and 21 are not swapped. Connec-tor 20 is reserved for the serial interface. The serial interface isused to read out instrument and process data from the paperlessrecorder. The connection and function of the serial interface are de-scribed in the Interface Description.

22


4.3 Setting the slave addressThe slave address is set via the paperless recorder or the setup program.

The baud rate is determined automatically (max. 12Mbps).

If a new device address is selected, the device has to be reset (switch off/on)for the new address to be accepted.

4.4 Diagnostic and status messagesIf errors occur during communication with the device, a message appears inthe header ( ) and in the “Instrument info” menu.

Please check the wiring and the master (PLC). It may be necessary to restartthe system.

4.5 Acyclic dataYou can read and write different measurement and process data of the paper-less recorder with “acyclic data” (from program version 100.03.03).

In order to establish the communication with the paperless recorder (device), itmust receive 3 info bytes and a maximum of 10 bytes of actual data.

Arrangementof the protocol

Setting Meaning

1 — 124 Slave address, as selected

125 The setting of the slave address can be predefined by the busmaster

H The acyclic data, too, can be transmitted through thecyclic data transfer.

Byte No. 1 2 3 4 — 13

contents control byte function address actual data

23


Control byte The control byte (byte No. 1) is organized as follows:

bit 0 — 3: length of actual data (in words)

bit 4 — 5: "toggle flag"The two bits have their state changed (toggled) with every newjob that is sent to the device so that it can recognize the newcommand. The bits may only be transmitted after the transmitbuffer has been fully prepared for the new command. Example:

bit 6 — 7: Response OK: bit 6 = 0 and bit 7 = 1Response faulty: bit 6 = 1 and bit 7 = 0Bits 6 and 7 are a signal to the PLC that the command has beenprocessed by the device and the next command to the devicecan be generated and transmitted by the PLC.

Function 03x: read10x: write

Bit 5

Bit 4

0 0 no job present

0 1 bit 4 is set, job 1 is being processed



... ... ..................................................................

Bit 7

Bit 6

Bit 5

Bit 4

0 0 0 1 bits 4 and 5 are returned un-changed by the device as a “job isbeing processed” info


1 0 0 1 fault-free processing of job with bit4 = 1

0 1 0 1 processing of job with bit 4 = 1 wasnot fault-free


1 0 1 0 fault-free processing of job with bit5 = 1

0 1 1 0 processing of job with bit 5 = 1 wasnot fault-free

... ... ... ... .........................................................

24


Address The addresses below can be read and written. The list corresponds to a por-tion of the addresses that are contained in the interface description of the pa-perless recorder. The address that is defined in the protocol is calculated as follows:

address = base address + address of variableExample: address for the measurement of analog input 6:

address = 0x35 + 0x0A = 0x3F

Base address: 0x35

Addressof variable Access Data type Signal designation

0x00 R/O RealReal meas. input 1 (analog input 1)

0x02 R/O Real meas. input 2 (analog input 2)




0x0A R/O Real meas. input 6 (analog input 6)

0x0C R/O Real meas. input 7 (analog input 7)

0x0E R/O Real meas. input 8 (analog input 8)





0x18 R/O Real not used

0x1A R/O Real not used

0x1C R/O Real not used

0x1E R/O Real not used

0x20 R/O Real counter value 1

0x22 R/O Real counter value 2

0x24 R/O Real external counter value 1 (from external I/O modules)

0x26 R/O Real external counter value 2 (from external I/O modules)

0x28 R/W Real external analog input 1(from external I/O modulesor via MODbus)

0x2A R/W Real external analog input 2

0x2C R/W Real external analog input 3

25


0x2E R/W Real external analog input 4

0x30 R/W Real external analog input 5
































26


Base address: 0xA6

Actual data A maximum of 10 bytes actual data may be defined. The number of the actualdata being used (in words) is stored in bits 4 — 13.

Commandsequence

• PLC sends job 1- PLC sets bit 4 in the control byte- PLC receives the answer “job OK” or “job faulty”

• PLC sends job 2- PLC resets bit 4 in the control byte and sets bit 5- PLC receives the answer “job OK” or “job faulty”

• PLC sends job 3- PLC resets bit 5 in the control byte and sets bit 4- PLC receives the answer “job OK” or “job faulty”

• and so on.

Example(write):

Text 1 for the batch report has to be written. Since a batch text may consist ofup to 20 characters, it is transmitted in 2 parts with 10 characters each. Cha-racter 21 (0x) can be dispensed with.

The following bytes have to be transmitted to the recorder:

a.) Byte 1 — 10

b.) Byte 11 — 20

Addressof variable Access Data type Signal designation

0x00 R/W char 21 text 1 for batch report

0x0B R/W char 21 text 2 for batch report



H Addresses are defined as bytes in the report, addressing of data word by word.

0x25 0x10 0xA6 0x54 0x68 0x75 0x65 0x72 0x69 0x6E 0x67 0x65 0x72

T h u e r i n g e r

0x15 0x10 0xAB 0x2D 0x42 0x72 0x61 0x74 0x77 0x75 0x72 0x73 0x74

- B r a t w u r s t

H When sending the first 10 characters, the start address is 0xA6.Since addressing is done word by word, the second 10 charactershave to be sent with the address from 0xAB (0xA6 + 5).

27


4.6 PLC data in 16-bit formatThe functions described below can only be implemented on paperless recor-ders from program version 100.03.05.

Internalmeasurementinputs of thepaperlessrecorder

From program version 100.03.05, the internal measurement inputs (1 — 6 or1 — 12) can not only be sent to the PROFIBUS master (PLC) in “Real” format(4 bytes), but also in “Integer” format (2 bytes).

Using the setup program for the paperless recorder, four values for measure-ment standardization have to be entered for all internal channels (not foreach individually).

- range start

- range end

- value at underrange

- value at overrange

The internal measurements are converted from “Real” format to “Integer” for-mat. In order to enable a uniform conversion, these four parameters have beeninserted.

The parameters are entered in the field “Interface 21”. The dialog can be calledup by a double click on the working area, or through the menu Edit ! Inter-face 21 (PROFIBUS-DP).

Externalmeasurement inputs of the paperlessrecorder

The external measurement inputs (1 — 36) can also be sent to the paperlessrecorder, either in “Real” format (4 bytes), or “Integer” format (2 bytes). Whichdata format is to be used, can also be decided with the help of the GSD gene-rator.

With the “Integer” format, the parameters Range start and Range end are usedto carry out standardization to 16 bits. This can be done through the setupprogram, or from the instrument keys.

28


The analog input of the PLC provides a 16-bit measurement in the range from-27648 to +27648; the ranges depend on the input sensor that was selectedor the input card being used.

ExampleInput

meas. rangeof PLC

Standardiza-tion range

of PLC

Rangepaperlessrecorder

Scalingpaperlessrecorder

Range start -10V -27648 -27648 -10

Range end +10V +27648 +27648 +10

First of all, the “Edit” buttonhas to be activated for the externalmeasurement inputs, ...

... then the exernal input can be activated and ...

... finally, standardization canbe carried out.

29


4.7 Bit-by-bit coding of binary signalsThe signals described below are available for paperless recorders with pro-gram version 100.03.05 or above and can be addressed using the GSD gene-rator.

Address Access Data type Signal designation

Alarm_Group1-6 R/O bit0 alarm group 10 = no alarm1 = at least 1 limit

infringed in group

R/O bit1 alarm group 2





R/O bit6-7 not used

Int. logic inp. 1-7 R/O bit0 logic input 1 0 = open / 1 = closed

R/O bit1 logic input 2






R/O bit7 not used

Additional_dig.signals

R/O bit0 combination alarm0 = no alarm1 = at least 1 limit

infringed in device

R/O bit1 diskette reserve signal0 = disk. reserve not yet reached1 = replace diskette

R/O bit2 fault0 = no fault / 1 = fault

R/O bit3-7 not used

30


4.8 External inputs on faults in the data exchangeAs long as there is no data exchange between the PLC and the recorder, theexternal analog inputs of the recorder are treated as “invalid” (display --------).Thus it is possible to detect, during the evaluation of the measurement data,that there were no valid values present for this period. This only applies to theexternal measurement inputs.

All other data (binary signals, batch texts, ...) will be frozen and remain at theircurrent values.

Output1-6 R/O bit0 relay output 10 = not active / 1 = active

R/O bit1 relay output 2




R/O bit5 open-collector output0 = not active / 1 = active

R/O bit6-7 not used

Ext.logic inp.1-6 R/W bit0 external logic input 10 = open / 1 = closed

R/W bit1 external logic input 2





R/W bit6-7 not used

Address Access Data type Signal designation

31


32

5 Data format of the recorder

When using recorders in a PROFIBUS-DP system, please take note of theirdata format.

Integer values Integer values are transmitted in the following format:

- first the high byte,

- then the low byte.

Float values/real values

The float/real values of the cyclic data for the paperless recorder are transmit-ted using the IEEE-754 standard format (32bits).

The float/real values for the acyclic data of the paperless recorder are trans-mitted in the MODbus format.

The IEEE-754 standard format and the MODbus format differ in the transmis-sion sequence of the individual bytes. In the MODbus format bytes 1 and 2 areswapped with bytes 3 and 4 (first the high byte, then the low byte).

Single-float format (32bits) as per IEEE 754 standard

S - sign bit (bit31) E - exponent in complement to base 2 (bit23 — bit30)M - 23bit normalized mantissa (bit0 — bit22)

Example: calculation of the real number from sign, exponent and mantissa.

byte1 = 40h, byte2 = F0, byte 3 = 0, byte 4 = 0

40F00000h = 0100 0000 1111 0000 0000 0000 0000 0000b

S = 0E = 100 0000 1M = 111 0000 0000 0000 0000 0000

Value = -1S · 2exponent-127 · (1 + Mb22·2-1 + Mb21·2-2 + Mb20·2-3 + Mb19·2-4 +…)

Value = -10 · 2129-127 · (1 + 1·2-1 + 1·2-2 + 1·2-3 + 0·2-4)

Value = 1 · 22 · (1 + 0.5 + 0.25 + 0.125 + 0)

Value = 1 · 4 · 1.875

Value = 7.5

SEEEEEEE EMMMMMMM MMMMMMMM MMMMMMMM

byte 1 byte 2 byte 3 byte 4

33

5 Data format of the recorder

MODbus float format

After/before the transmission from/to the device, the bytes of the float valuehave to be swapped accordingly.

Many compilers (e.g. Microsoft C++, Turbo C++, Turbo Pascal, Keil C51) storethe float values in the following order (Intel compatibility):

float value

Please check how float values are stored in your application. If necessary, thebytes have to be swapped accordingly.

Address x Address x+1

MMMMMMMM MMMMMMMM SEEEEEEE EMMMMMMM


Storageaddress x

Storageaddress x+1

Storageaddress x+2

Storageaddress x+3

MMMMMMMM MMMMMMMM EMMMMMMM SEEEEEEE


34

Documents

PROFIBUS-DP - Jumo · PROFIBUS-PA PROFIBUS-PA has been specifically ... As a suitable cable we recommend the following type from Siemens: Simatic Net Profibus …